Collapsible form



w. H. MALTMAN AND T. R. McCOY.

COLLAPSIBLE FORM.

APPLICATION HLED OCT. 18, 1920.

Patented Sept. 27, 1921.

; INVENTORS W H. Mallnm M FEM W i also have to beplaced in theairsatisfactory to a certain extent, but does not provide abulldlllgflfil'lgld as onemade of. 30

besidesis more expensive.

tween the walls to takejthe place of wooden UNITED STATES.

PATENTOFFICE;

WILLIAM H. MALTMANTAND TIMOTHY nxmcoo r, "or sTocKTomcALIFoRNIA.

coLLArsIBnE FORM. 9

Specification of Letters Patent.

Application filed 0ctober118, 1920. Seria1 No. 417,604.

To all whom it may concern: 1

Be .it known that we, WILLIAM, H. MALT- MAN and .TIMo'rHY R.MoCon'citizens of the United States, residing at Stockton, county of SanJoaquin, State of California,

have'invented certain new and. usefulPImtion, especially for largebuildings, to be double walls of poured concrete. Single walledbuildings, of this material have long been used, but are open to theobjection that concrete too readily absorbs moisture, and, hence theinterior of buildings so constructed are damp in wet weather. Hollowblocks have also been used, and solid blocks laid in spaced rows toprovide an air passage therebetween.- Such a construction is pouredconcrete, suitably reinforced, and

Heretofore, however, as far as we are is aware, there has been no, wayin which to build double poured walls, owing to the almost impossibilityof removing the wooden forms commonly used and which would I passage orspace between the two walls.

therefore is to provide a form for this purpose, that is, one which maybe placed beor other similar forms, and which may be readily collapsedor contracted when the concrete is set, so as topermit of" its beinginstantly withdrawn. a

' Another object is to provide av form of this character which will forma permanent part of the builders equipment, since even when once used,its identity is not" destroyed as in the case of wooden forms, but canbe 'used over and over again.

A third object is'to so constructtlieform so that it may 'erenceindicate inner plate 4; having an,

6 overlapping the I plate if outer quickly and easily be put in placeand withdrawn and which, requires no setting up oriputting together whenit is desired to utilize the same.

Patented Sept; 27, 19 21 I A further object of the invention to producea simple and inexpensive device,

andyet one which will beexceedingly effective for the purposes which itis, designed.

Theseobjects we accomplish by means of Such structnre and relativearrangement of parts. as will fully appear by a perusal of the followingspecification and claims.

In the drawings similar characters. of refcorresponding-parts in theseveral views. v i

Figure lis a perspective elevation of a pair of forms shown in positionside by side. F 1g. 2 is a front elevation of a form, the outerplate. orcover being removed. i

Fig. 3-is a cross section taken on a line T3? of Fig.2. 1 ,F1g..4 is asimilar'view on a line 4-4 of Fig. 2. Y

Referring now more particularlyto the characters of reference on thedrawings, the

numeral 1 denotes. the ,form in general, WhlCh 1s a rectangularboxj-like structure,

-preferably of sheetimetal, and open at the top and bottom. Thisstructure isbuilt .up of-two spaced and parallel pairs of sidewalls 2and 3, the pair,2 consisting of an end-flange, 5 turned inwardly atright angles, and an outer plate t'fand; having also Y an end, flange 7parallel to the flange-5f forming an end-wall.

The plates 4 and 6 are held together against relative longitudig e I.nal movement while allowing for transverse The pr ncipal ob ect of our'11'1V6I1t101'1] sliding movement of the one on the other by means ofbolts or rivets 8 in the plate6, Y which extend through transverseslots'9 in the inner plate 4.

verse sliding-movement by meansfof slots -a drivets 12 and 13, similarto thOSeprol d h plates land 6; I

The plates 10 and 11 are also provided with endfianges '14, which areadjacent to but overlapped by the end flanges 5 and v7 'of the plates 4;and 6.- Bolts or'rivets 15 in these outenflanges pass throughslots 16cut 7 in the inner flanges 14:, these'slots extending so that each oneisa complete unit in itself,

in the same plane as the. 's1ots 9 and Thus an inclosed structure isformed which is capabl of being varied in size both as to width andthickness.

To meehanicallyalter the size-of the form when desired, we provide thefollowing 7 18 is another pair of toggle arms 21, which are angledoppositely to the bars 18 and are connected to a bar 22. extendingalongside the bar 19 and alsoprojecting from the upper end of the formto terminate in a handle 23. In order'to expand or-contract the width ofthe form, both bars 19 and 22 must be moved at the same time but inopposite directions; To limit the amount of expanding movement atfwill,a collar 24' is adjustably mounted on the 'bar 22," adapted to engage ashoulder 25 on the bar19, thus permitting opposed movement of the barsand consequent expansion of the form, to

the extent determined by the setting of the collar, v r v i To alter thethickness of the mold at the same time as the preceding operation iscar- "ried out, strips 26 are hinged on the bar-19, and have transverserollers 27 mounted at their ends, these rollers riding on inclinedsurfaces 28 on the bars 17,.and also bearing against the innerform-plate 4, these inclines slanting outwardly from the bars toward theplate 4 in the direction of movement of the bar 19 to expand the form.

Coil springs 29 extend between the two' inner form-plates 4: and lO, todraw the same together when-the rollers aremoved in a direction tocontractthe form. Y

. At one end of the form flanges 30 extend beyond the end flanges andparallel to the side-plates, these flanges having spaced notches 31 toallow for the passage of the double wall tie-bars 32 therethrough.

In operation, the required number ofour the desired width then set inposition end to end and adjoining as shownin Fig. 1.

. The tie bars 32 are then placed through the notches 31, after whichthe outer-wall forms are built up.

' set, the collapsible forms are withdrawn.

This is done by. suitable manipulation of the handles 20 and 23,"whichcontracts the} by the amount of movement inan expansiv'e direction maybe regulated.

form both ways, freeing it from the c crete Also area, and horizontallynotched and vertiand which move in opposite directions,;the-

pressure on one handle in one direction is equalized by the pull on theother, and all pressure and strain is taken off the form itself. 7 o

"If desired, these forms may be made, to expand or contract only in onedirection, by omitting those features which allow its alteration of sizein the otherdirection.

While we have shown handles'on the expansion-actuating bars, racks maybe provided instead on the adjacent facesof the bars, with acommonpinion turned by a crank positioned therebetween;

From the foregoingdescription it will be readily seen that we haveproduced such a device as substantially fulfils the objects oftheinvention as set forth herein.

"While this specification sets forth in detail the present and preferredconstruction of the device, still in practicesuch deviations from suchdetail may be resorted to as do not form a departure from the spirit ofthe invention as defined by the appended claims.

Having thus described our invention what we claim as new and useful anddesire to secure by Letters Patent is l p 1. A collapsible formcomprising inclosing walls arranged for telescopic. movement'to alterthe cross sectional area of the inclosure, and, means whereby all areasthus obtained will be symmetrical in shape to each other. i p v 2. Acollapsible form comprisingrectangular inclosing walls adapted fortelescopic movement to contract the inclosed cally disposed flangesonone of the end 'walls. of the form whereby metal wall-tie bars may belocated after the forms are set up in close alinement. p

3.. A collapsible form comprising inclosv ing walls arranged fortelescopic movement to alter the cross-sectional area of the inclosure,a toggle-jointmechani'sm for altering ,thenwidth of the form and aroller-andimproved forms are first. expanded. to give.

incline mechanisjm'ifor. altering {the thick-J2 ness thereof, both'saidmechanisms being in closedwithinthe form and connected tobe actuatedsimultaneously. I

5. A collapsible form comprising inclosto be moved longitudinally of theform, ing Walls arranged for telescopic movement another hand-baradjacent the first named to alter the cross-sectional area of theinclobar, and means connecting said last named sure, a toggle-jointmechanism for altering bar With the toggle mechanism whereby 5 the Widthof the form and a roller-andboth hand bars must be moved simultal5incline mechanism for altering the thickneously but in oppositedirections.

ness thereof, both said mechanisms being in- In testimony whereof Weaffix our signaclosed Within the form, a hand-bar protures. jectingoutwardly from one end of the form WILLIAM H. MALTMAN.

10 comiected to both mechanisms and adapted TIMOTHY R. MCCOY.

